portal_vfsops.c revision 151897
1/*- 2 * Copyright (c) 1992, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95 33 * 34 * $FreeBSD: head/sys/fs/portalfs/portal_vfsops.c 151897 2005-10-31 15:41:29Z rwatson $ 35 */ 36 37/* 38 * Portal Filesystem 39 */ 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/domain.h> 44#include <sys/filedesc.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/mutex.h> 48#include <sys/malloc.h> 49#include <sys/file.h> /* Must come after sys/malloc.h */ 50#include <sys/mount.h> 51#include <sys/proc.h> 52#include <sys/protosw.h> 53#include <sys/socket.h> 54#include <sys/socketvar.h> 55#include <sys/vnode.h> 56 57#include <fs/portalfs/portal.h> 58 59static MALLOC_DEFINE(M_PORTALFSMNT, "portal_mount", "PORTAL mount structure"); 60 61static vfs_unmount_t portal_unmount; 62static vfs_root_t portal_root; 63static vfs_statfs_t portal_statfs; 64 65static const char *portal_opts[] = { 66 "socket", "config", 67 NULL 68}; 69 70static int 71portal_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 72{ 73 struct portal_args args; 74 int error; 75 76 if (data == NULL) 77 return (EINVAL); 78 error = copyin(data, &args, sizeof args); 79 if (error) 80 return (error); 81 82 ma = mount_argf(ma, "socket", "%d", args.pa_socket); 83 ma = mount_argsu(ma, "config", args.pa_config, MAXPATHLEN); 84 error = kernel_mount(ma, flags); 85 86 return (error); 87} 88 89/* 90 * Mount the per-process file descriptors (/dev/fd) 91 */ 92static int 93portal_mount(struct mount *mp, struct thread *td) 94{ 95 struct file *fp; 96 struct portalmount *fmp; 97 struct socket *so; 98 struct vnode *rvp; 99 struct portalnode *pn; 100 int error, v; 101 char *p; 102 103 if (vfs_filteropt(mp->mnt_optnew, portal_opts)) 104 return (EINVAL); 105 106 error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v); 107 if (error != 1) 108 return (EINVAL); 109 error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL); 110 if (error) 111 return (error); 112 113 if ((error = fget(td, v, &fp)) != 0) 114 return (error); 115 if (fp->f_type != DTYPE_SOCKET) { 116 fdrop(fp, td); 117 return(ENOTSOCK); 118 } 119 so = fp->f_data; /* XXX race against userland */ 120 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 121 fdrop(fp, td); 122 return (ESOCKTNOSUPPORT); 123 } 124 125 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 126 M_TEMP, M_WAITOK); 127 128 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 129 M_PORTALFSMNT, M_WAITOK); /* XXX */ 130 131 error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */ 132 if (error) { 133 FREE(fmp, M_PORTALFSMNT); 134 FREE(pn, M_TEMP); 135 fdrop(fp, td); 136 return (error); 137 } 138 139 rvp->v_data = pn; 140 rvp->v_type = VDIR; 141 rvp->v_vflag |= VV_ROOT; 142 VTOPORTAL(rvp)->pt_arg = 0; 143 VTOPORTAL(rvp)->pt_size = 0; 144 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 145 fmp->pm_root = rvp; 146 fhold(fp); 147 fmp->pm_server = fp; 148 149 mp->mnt_flag |= MNT_LOCAL; 150 mp->mnt_data = (qaddr_t) fmp; 151 vfs_getnewfsid(mp); 152 153 vfs_mountedfrom(mp, p); 154 fdrop(fp, td); 155 return (0); 156} 157 158static int 159portal_unmount(mp, mntflags, td) 160 struct mount *mp; 161 int mntflags; 162 struct thread *td; 163{ 164 int error, flags = 0; 165 166 167 if (mntflags & MNT_FORCE) 168 flags |= FORCECLOSE; 169 170 /* 171 * Clear out buffer cache. I don't think we 172 * ever get anything cached at this level at the 173 * moment, but who knows... 174 */ 175#ifdef notyet 176 mntflushbuf(mp, 0); 177 if (mntinvalbuf(mp, 1)) 178 return (EBUSY); 179#endif 180 /* There is 1 extra root vnode reference (pm_root). */ 181 error = vflush(mp, 1, flags, td); 182 if (error) 183 return (error); 184 185 /* 186 * Shutdown the socket. This will cause the select in the 187 * daemon to wake up, and then the accept will get ECONNABORTED 188 * which it interprets as a request to go and bury itself. 189 */ 190 soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2); 191 /* 192 * Discard reference to underlying file. Must call closef because 193 * this may be the last reference. 194 */ 195 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 196 /* 197 * Finally, throw away the portalmount structure 198 */ 199 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 200 mp->mnt_data = 0; 201 return (0); 202} 203 204static int 205portal_root(mp, flags, vpp, td) 206 struct mount *mp; 207 int flags; 208 struct vnode **vpp; 209 struct thread *td; 210{ 211 struct vnode *vp; 212 213 /* 214 * Return locked reference to root. 215 */ 216 vp = VFSTOPORTAL(mp)->pm_root; 217 VREF(vp); 218 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 219 *vpp = vp; 220 return (0); 221} 222 223static int 224portal_statfs(mp, sbp, td) 225 struct mount *mp; 226 struct statfs *sbp; 227 struct thread *td; 228{ 229 230 sbp->f_flags = 0; 231 sbp->f_bsize = DEV_BSIZE; 232 sbp->f_iosize = DEV_BSIZE; 233 sbp->f_blocks = 2; /* 1K to keep df happy */ 234 sbp->f_bfree = 0; 235 sbp->f_bavail = 0; 236 sbp->f_files = 1; /* Allow for "." */ 237 sbp->f_ffree = 0; /* See comments above */ 238 return (0); 239} 240 241static struct vfsops portal_vfsops = { 242 .vfs_cmount = portal_cmount, 243 .vfs_mount = portal_mount, 244 .vfs_root = portal_root, 245 .vfs_statfs = portal_statfs, 246 .vfs_unmount = portal_unmount, 247}; 248 249VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 250